Change some config options to be automatically selected

Hello,
Here are two patches, which have for goal to simplify in Kconfig the selection of the options WMI and BACKLIGHT_CLASS_DEVICE. Both are not something that anyone will want per se, but only some kind of libraries used by other modules. Some modules "selected" them while other just "depended on" them, so to make things more consistent and easier to use, always select those options.

I'm not sure if there is anyone who feels really the maintainer of the platform-x86 directory, so probably it's for Andrew to get them in his tree :-)

Cheers,
Eric

Matthew Garrett maintains the platform-x86 directory.

Cheers,
-Len